Info-index with multiple indexes

[Aubrey Jaffer]

info --version
info (GNU texinfo) 4.8

emacs --version
GNU Emacs 21.4.1

The appended texinfo code (from
http://cvs.savannah.gnu.org/viewcvs/scm/scm/scm.texi?rev=1.260&view=markup)
puts each of four indexes as unnumberedsec nodes within one "Indexes"
node.  The indexes work in standalone info, but not in Emacs info,
which reports "No index".

                             -=-=-=-=-=-

  @node Indexes,  , The Implementation, Top
  @unnumbered Indexes

  @menu
  * Procedure and Macro Index::   
  * Variable Index::              
  * Type Index::                  
  * Concept Index::               
  @end menu

  @node Procedure and Macro Index, Variable Index, Indexes, Indexes
  @unnumberedsec Procedure and Macro Index

  This is an alphabetical list of all the procedures and macros in SCM.

  @printindex fn

  @node Variable Index, Type Index, Procedure and Macro Index, Indexes
  @unnumberedsec Variable Index

  This is an alphabetical list of all the global variables in SCM.

  @printindex vr

  @node Type Index, Concept Index, Variable Index, Indexes
  @unnumberedsec Type Index

  This is an alphabetical list of data types and feature names in SCM.

  @printindex tp

  @node Concept Index,  , Type Index, Indexes
  @unnumberedsec Concept Index

  This is an alphabetical list of concepts introduced in this manual.

  @printindex cp